# -*- coding: utf-8 -*-
# @Time    : 2021/5/13 10:43
# @Author  : like
# @File    : views.py
# @Software: PyCharm
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer


@api_view(['GET', 'POST'])
# 给我们的网址添加可选的格式后缀,format=None
def snippet_list(request,format=None):
    """
    列出所有的snippets，或者创建一个新的snippet。
    """
    if request.method == 'GET':
        snippets = Snippet.objects.all()
        #  `ListSerializer` classes instead when `many=True` is set.我们也可以序列化查询结果集（querysets）而不是模型实例。
        #  我们只需要为serializer添加一个many=True标志。
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)

    elif request.method == 'POST':
        serializer = SnippetSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


@api_view(['GET', 'PUT', 'DELETE'])
def snippet_detail(request, pk,format=None):
    """
    获取，更新或删除一个snippet实例。
    """
    try:
        snippet = Snippet.objects.get(pk=pk)
    except Snippet.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)

    if request.method == 'GET':
        serializer = SnippetSerializer(snippet)
        return Response(serializer.data)

    elif request.method == 'PUT':
        serializer = SnippetSerializer(snippet, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    elif request.method == 'DELETE':
        snippet.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)
